/*
Copyright 2024 The HAMi Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package client

import (
	"os"
	"path/filepath"

	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/klog/v2"
)

var (
	KubeClient kubernetes.Interface
)

func init() {
	var err error
	KubeClient, err = NewClient()
	if err != nil {
		panic(err)
	}
}

func GetClient() kubernetes.Interface {
	return KubeClient
}

// NewClient connects to an API server.
func NewClient() (kubernetes.Interface, error) {
	kubeConfig := os.Getenv("KUBECONFIG")
	if kubeConfig == "" {
		kubeConfig = filepath.Join(os.Getenv("HOME"), ".kube", "config")
	}
	config, err := clientcmd.BuildConfigFromFlags("", kubeConfig)
	if err != nil {
		klog.Infof("BuildConfigFromFlags failed for file %s: %v using inClusterConfig", kubeConfig, err)
		config, err = rest.InClusterConfig()
		if err != nil {
			klog.Errorf("InClusterConfig Failed for err:%s", err.Error())
		}
	}
	KubeClient, err := kubernetes.NewForConfig(config)
	if err != nil {
		klog.Errorf("new config error %s", err.Error())
	}
	return KubeClient, err
}
